Radiating furnace



March 9, 1943. c; 1.. SPRING 2,313,370

RADIATING FURNACE Filed Dec 18, 1940 2 Sheets-Sheet l l l l 1 I 1N VENTOR.

E- L. SPRING March 9, 1943. c IN 2,313,370

RADIATING FURNACE Filed Dec. 18, 1940 2 Sheets-Sheet 2 INVENT OR.

BY [114. EIPEINE Patented Mar. 9, 1943 UNITED s'rAres PATENT OFFICE 1 Claim.

The principal object of my invention is to provide a radiating furnace that will efilciently radiate a great amount of heat and which has reduced radiating dues to present a radiating surface consistent with the reduction of volume in the cooling gases passing therethrough.

A further object of this invention is to provide a radiating furnace structure having a long heat travel contained in a small space and one which has a great amount of radiating surface.

A still further object of my'invention is to provide a radiating furnace structure that is extremely economical in manufacture, durable and eillcient in use.

These and other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, pointed out in my claim and illustrated in the accompanying drawings, in which:

Fig. i is a side cross sectional view of my complete furnace construction taken on the line i-l of Fig. 2.

Fig. 2 is a front elevational view of the furnace and radiator more fully illustrating its construction.

Fig. 3 is an end cross sectional view of a portion of the furnace taken on the line 3-! of Fig. 1.

Fig. 4 is a top cross sectional view of the furnace taken on the line 4-4 of Fig. 1.

There are a great number of furnaces on the market designed for specific types of heating units. Some of these furnaces are bulky, do not have sufficient radiating surfaces within the furnace jacket and do thereby permit high stack temperatures and lower the eiliciency of the furnace as a heating medium. Furthermore, these furnaces have a radiating stack of the same dimension throughout, whereas the gases are condensed as they cool, thereby preventing the utilization of a great amount of heat with attendant high stack loss. I have overcome such disadvantages as will be appreciated, and as will be hereinafter more fully set forth.

Referring to the drawings, I have used the numeral It to designate the combustion chamber of my furnace having a fuel inlet ii through which may be introduced any type of heating element such as the nozzle of,an oil burner, which I have designated by the numeral II. The numeral It indicates legs formed on the bottom portion of the chamber It. The numeral ll indicates a horizontally disposed radiating chamber in communication with the upper end of the combustion chamber iii and extending rearwardly therefrom. The numeral it indicates a visual inspection window placed in the forward end of the tube it as shown in the drawings. The numeral Ii indicates a housing having its lower end open and in communication with the upper rearward end of the radiating chamber ll. 1 have used the numerals II and I! to indicate two flues each having their rearward end in communication with the upper end of the housing l5 extending forwardly and tapering to a smaller area toward their forward ends. The numeral 18 indicates a second housing of smaller capacity than the housings i5 and having its lower inside portion in communication with the smaller ends of the tubes l8 and I1. The numeral i9 indicates a tube having its forward end in communication with the inside of the housing i8, tapering to a smaller area as it progresses away from the housing i l and terminating in a stack flange 20 as shown in Fig. 1 of the drawings. I have used the numeral 2| to indicate a jacket placed about the furnace unit in the usual manner and having the ordinary outlet pipe 22 and inlet pipe 28 as shown by dotted lines in Fig. l of the drawings.

The practical operation of my device is as follows:

Heat is generated within the combustion chamber "I through the medium of an oil burner, stoker, or other source of suitable heat supply, and the hot gases rise and are drawn by chimney draft upwardly and into the radiating chamher it. This radiating chamber has a smaller diameter or area than the area of the combustion chamber III to compensate for the contraction of the gases as they are cooled. The gases then pass into the housing l5, thence into the larger ends of the tubes It and I1 and thence pass into the housing l8, through the tube It and into the chimney or stack. The areas of the various units of the furnace are progressively smaller. The housing I! is of smaller capacity than the chamber H, the tubes l8 taper from the chamber ii to the chamber i8, the chamber i8 is of smaller capacity than the entire outlet area of the tubes l8 and I1, and the stack portion 20 is of smaller area than the inlet of the tube It at its junction with the housing II. The entire outer surface area of the chamber Ill, the radiating chamber ll, the housings l5 and II, the tubes l8 and I1, and the tube I! are radiating surfaces radiating heat into the Jacket or cash" II. The progressive tapering oi the radiating flues provide for the close adherence of the contracting gases to the radiating surfaces. thereby preventing loss or heat through gas expansion and preventing a stack draft in excess or the amount required for the heat generated. Although I have shown the tubes II, I! and I! as being round, they may be oi any shape, so long as they are reduced progressively in proportion to the cooling of the gases and consequent condensing oi the gases as they lose their heat to the! radiating surfaces. The visual inspection window l4 may be used for viewing the flame within the combustion chamber.

Thus it will be seen that I have provided a radiating furnace structure which fulfills all or my objects, is efficient, .provides for the economical combustion of the fuel, provides adequate radiating surface, a low stack temperature and high efllclency relative to the heat generated. My furnace structure makes possible a great economy in fuel and prevents losses of heat energy.

Some changes may be made in the construction and arrangement 01' my improved radiating furnace without departing from the real spirit and purpose of my invention. and it is my intention to cover by my claim any modified forms of structure or use 0! mechanical equivalents which may be reasonably included within their scope.

I claim:

In a radiating iurnace structure. a combustion chamber, a housing in communication with the upp r end of said combustion chamber and having a smaller volume than said combustion chamher, a second housing having a smaller volume than said first mentioned housing. a plurality of tapered i'iue elements each having their larger ends in communication with said iirst mentioned housing and their smaller ends in communication with said second mentioned housing. and a tapered iiue member having one oi. its ends in communication with said second mentioned housing being progressively reduced in area as it progresses away from said second mentioned housing and terminating in a stack flange; said first and said second mentioned housings together with said flue members presenting a continuous progressive reduction'o! capacity from said combustion chamber to said stack flange.

CLAUDE L. SPRING. 

